Hi Stevekemp, Both watches which will be supported by the app have at least 3 axis accelerometers and 3 axis gyroscope, meaning the watch understands various p

Hi Stevekemp, Both watches which will be supported by the app have at least 3 axis accelerometers and 3 axis gyroscope, meaning the watch understands various plans on motion in relation to is position on earth and can track those movements very accurately. Given the exercises you're using in your example, squat and over-head press, the wrist will travel through a specific plane of movement (when done properly) for each exercise respectively. For example, Stand up and put your hands up as if your holding the barbell on your back, as you would in a squat and perform a proper squat....straight up and down.... Now tilt forward to curve your back as you describe in your comment and do a squat... Did you notice that you've now changed the plane of movement your wrist traveled between the proper squat and "bad form" squat? This is how the app would work and though that may seem like subtle difference in the wrist to you and I, to these motion sensing technologies, its a major difference that can be detected. Thanks for the great question and hopefully this helps!!